package C9_7_IntroduceNullObject;

/**
 * @author xugang1
 * @updated 2022/7/25
 * @description 引入Null对象
 */

public class Customer {
    String _string;
    BillingPlan _billingPlan;
    PaymentHistory _paymentHistory;

    public String getName(){
        return _string;
    }

    public BillingPlan getPlan() {
        return _billingPlan;
    }

    public PaymentHistory getHistory() {
        return _paymentHistory;
    }
}